Except it has changed in the last couple of decades (probably not due to 9/11, but still), because size and weight limits for hand luggage keep getting smaller and smaller. I have always travelled light and avoided checking in luggage except for very long stays abroad, but it's becoming increasingly difficult.
For example, both Qatar and Etihad (very common airlines to travel between Europe and Asia) now limit hand luggage to 7 kg (and in the case of Etihad, they don't even allow the typical "personal item"). 7 kg is laughably little, a standard cabin bag already weighs 2. Pack a laptop and you'll struggle to pack even summer clothes for a few days. Let alone winter clothes or -oh, the luxury!- buying some souvenirs at your destination.
Fortunately, in my experience, they mostly just don't look. But they could, if you're unlucky. And even if they don't, the dwindling limits also reduce practical slack, i.e. with a formal limit of 9 kg I would feel comfortable packing 10 or 11 because most airport staff probably wouldn't be strict about that, but with 7, packing 10 or 11 starts looking like a real gamble.